org.apache.wicket.markup.html.form.ListChoice?

[T P D]

org.apache.wicket.markup.html.form.ListChoice is pretty much its 
superclass, org.apache.wicket.markup.html.form.DropDownChoice; only two 
methods are overriden.

But ListChoice overrides supportsPersistence() to return true. Why?
Why would a ListChoice be always persistent, and a DropDownChoice not be?

Thanks,
Tom